Tubing-head heater



July 1 1924.

J. C. WOODSON TUBING HEAD HEATER F iled Nov. 16 1921 2 Sheets-Sheet 1 gE wgusssl-zsz INVENTOR 'a W James C. l/l/oodsan M BY l AIT-TORNEY it is not herein described in detail and is Patented July 1, 1924.

UNITED STATES PATENT OFFICE.

JAMES C. WOODSON, OI MANSFIELD, OHIO, ASSIGNOB TO WESTINGHOUSE ELECTRIC PRODUCTS COMPANY, A. CORPORATION OF MICHIGAN.

TUBING-Em]: HEATER.

Application filed November 18, 1921. Serial No. 515,687.

To all whom it may come'm:

Be it known that I, JAMES C. WOODSON, a} citizen of the United States, and a resident of Mansfield, in the county of Richland and Stateof Ohio, have invented a new and useful Improvement in Tubing- Head Heaters, of which the following is a specification.

My invention relates to electrically heated apparatus ing units for the die blocks of tubing machinesfand it has for its object to provide a relatively simple and compact heating unit which may be quickly mounted on, and removed from, the head of a tubing machine of standard design. 1

In practising my invention, I provide a two-part annular casing having an open 1nner face and place therein a plurality of refractory resistor members each of which is provided with a plurality of open grooves adjacent the inner face thereof. I provide a resistor member located in the grooves and I provide also a terminal blocklocated in the annular casing and a cover member therefor. Means are provided to permit of mounting the heating unit on the head of the tubing machine.

In the drawings,

Figure 1 is a view, in side elevation, of a tubing machine upon the head of which is mounted a device embodying my invention;

Fig. 2 is a top plan view, of a device embodying my invention, portion being cut away, an

Fig. 3 is a view, in diametralcross section, of the device embodying my invention, taken on the line III-III of Fig. 2.

A commercial type of tubing machine is illustrated in Fig. 1 and designated by the numeral 10. A means for operating the machine may comprise an .electric motor 11 suitably connected thereto. As such a machine 1s a commercial device and specifically constitutes no part of my invention,

illustrated only in order to show the mounting of my improved heating unit, designated generally by the numeral 12, upon and surrounding the end of the head of the ma- "chine.

The heating unit 12 comprises two cooperating annular metal members 13 and 14, which are both of substantially L-shape and particularly to electric heat in cross section, each with a relatively small inturned flange portion 15 at the inner face. Lu 16 and 17 are secured respectively agalnst the members 13 and 14 in oppositely spaced relation to permit of clamplng the lugs 16 and 17 and, consequently, the members 13 and 14 in proper operative posigign by means of a screw bolt 18 and a nut A plurality of refractory resistor-supporting members 21 of' substantially trapezoidal contour are placed within the annular space provided between the members 13 and 14. The peripheral width of the outer face of the members 21 is such that a suitable number of the members 21 and a terminal block 22 fit into the annular. periphery of the casing 12 an opening 23 being provided in the periphery of the easing through which a shoulder portion 24 of the terminal block extends. A plurality of open grooves 25 is provided in each of the members 21, the grooves being adjacent the inner surface of each of the supporting members and having overhanging walls so that ahelically wound resistor member 26 may be threaded into the grooves 25 of the members 21 and be retained therein, while permitting of radiating therefrom a relatively large proportionof heat generated.

The ends of the resistor member 26 ma 22 by means of screw. bolts 27, having aplurality of. nuts 28 mounted thereon to permit of connecting thereto a plurality of supply-circuit conductors 29 which may be connected directly to a supply circuit (not shown) or, more usually, to controlling devices, such as a switch (not shown).

A cover member 31 may be secured against the casing 12 in such position as to cove rthe terminal block and the outer end of the bolts '27. Insulating bushings 32 may be located in the cover member 31 to suitably insulate the conductors 29 from the metallic cover member 31.

.A reflecting member 33 is mounted on the outer surface of the heating unit 12, being secured thereto by means of a pluralit of screws 34. The reflecting member is o substantially convex form, the concave surface thereof being so located as to constitute the outer surface, and the inner surface bein suitably. polished to effect the reflection o a large portion of the heat if desired I generated and radiated fore thereagainst. A central opening 35 is provided in the reflector 33 through which the finished tubing may pass. I A

A pluralit of lugs 36 are secured to the casing, eing located on d ametrally alined points, and are each provided with an opening 37 therethrough to permit of se curing the heating unit against the machine 10 by means of bolts 38. o

A heating unit, constructed as herembedescribed, may be quickly mounted in 1ts proper operative position on the head of a tubing machine to maintain the head and the die blocks at a desired temperature and may also be quickly removed therefrom and be quickly disassembled to permit of repair should this become necessary. The reflector member is effective to reduce the amount of heat which is radiated by the resistor away from the head of the machine and to reflect a relatively large portion of the heat radiated against its inner surface back against the head of the tubing machine;

Various modifications may be made in the device embodying my invention without departing from the spirit and scope thereof, and I desire that only such limitations shall be placed thereon as are imposed by the prior art or are specifically set forth in the appended claims.

I claim as my invention 1. In an electric heater, in combination, a substantially circular casing having an open inner surface, a refractory resistorsupporting means in said casing, a resistor located in said supporting means and a reflector secured to one end surface of the said casing and having a central aperture.

In an electric heater, in combination, a substantially circular casing having an open inner surface, a plurality of refractory resistor-supporting members located in said casing, eac of said supporting members having a plurality of grooves on the inner surface thereof, a resistor member located with the supporting in said grooves and a reflectof secured to one end surface of the said casing and having a central aperture.

In an electrically heated device for maintaining a predetermined temperature at the end of a tubing-machine head, in combination, a substantially circular metallic casing having an open inner surface, a plurality of refractory resistor-supporting members located in side-by-side relation in said casing, bers having a plurality of grooves extending laterally therethrough on the inner surface thereof, a helically wound resistormember extending through said grooves, a terminal block ing outwardly therefrom, terminals mounted in said block, a cover member for said terminals, a reflector partly enclosing the outer lateral surface of said casing and,

means for securing said casing against said tubing-machine head. 4. In an electric heating device for maintaining a predetermined temperature at the end of a tubing-machine head, in combination, a separable two-part, substantially circular casing having an open inner surface, a plurality of laterally-grooved refractory resistor-supporting members located in said casin a terminal block also in said casing and covering, in combination members, substantially all of the periphery of said casing, a flexible resistor-member supported by said refractory supporting members, terminals mounted in said terminal block and extending beyond the outer periphery of said casing, a cover member for said terminals secured .to said casing, means for securing each of said supporting memin said casing and extend- 1 said casing against said tubing-machine 7 JAMES cwooDsoN. 

